Rackmount UPS units keep switches, firewalls, servers and recorders running through short outages, and give them time to shut down cleanly in long ones. All four models here are line-interactive with automatic voltage regulation, which suits most network closets.
The CyberPower OR1000LCDRM1U and OR1500LCDRM1U fit in a single rack space. The CyberPower CP1500PFCRM2U and the APC Smart-UPS SMT1500RM2UC take 2U and put out a pure sine wave, which active-PFC power supplies prefer. Check the watt rating, not just the VA, against what you plan to plug in, and compare the UPS depth with your rack. The rackmount UPS guide explains the types.
